John j



(No Model.)

` J. J. DE LANG-BY.

No. 261,688. Patented July 25, 1882.. jl/'a1 I J7 I C: :I:

I armi 2 l a [mn @E \\l NY a? j e Af/ e v/ e? c \\\\\\\\\\\\i INF L\\\\Ik\\\\\\\\\\\\\ WITNBSSES' Y INVENTOR: W 0M/MMM BY umm@ ATTORNEYS.

UNITED STATES.

PATENT OFFICE.

JOHN .Lne Lancer, or BINGHAMTON, New YORK.

BALANCED SLIDE-VALVE.

SPECIFICATION forming part of Letters Patent No. 261,688, dated July 25,1882,

` Application filed April 27, 1882. (No model.)

To all inkom it may concern: Beit known that I, JOHN J. DE LANOEY, of

. Binghamton, in the county of Broome and State of New York, haveinvented a new and useful Improvement in Balanced Slide-Valves, of whichthe following is a full, clear, and exact description.

My invention relates to that class of slidevalves that are tted to workbeneath a faceplate placed in the steam-chest.

My present invention relates to improvements on the slide-valve patentedto me June 20,1876, No. 179,002; and it consists in certain features ofconstruction and arrangement whereby the operation of the valve isrendered more effective and excessive wear prevented, as hereinafterdescribed and claimed.

Reference is to `be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure l is a plan viewbf steam-chest containing the improved valve, thecover of the chest being removed. Fig. 2 is a plan view, with theface-plate removed from the chest, showing the balance-plate of thevalve. Fig. 3 is a plan view of the valve with the balanceplate removed.Fig. 4 is an inverted plan view of the balance-plate. Fig. 5 is atransverse section of the valve in the steam-chest with the parts inposition.

12A is the valve, which is made hollow, of rectangular form, and withperpendicular faces on both its inner and outer sides. B is thesteamchest, having a movable cover, a. G is the face-plate tting in thesteam-chest above the valve, and D is a slotted balance-plate upon thevalve and beneath the faceplate.

' The upper edges of the valve A are formed with longitudinal grooves,that receive the packing-bars c, these bars being connected at eachcorner by square lap-joints,-so that the longer side bars support theshorter end bars, and beneath these packingbars are platesprings d d,that act tolpress the packin gs outward. The packing-bars c are madesquare in cross-section, sothat the steam Awill have equal surfaces toact upon at each side, and so that the springs will operate the sameunder pressure as theydo without the pressure on a seat or face-platethat is worn out of surface.

In the sides of the valve A are apertures ee for admission of steambeneath the packingbars. The balance-plate D is in steam-tight contactwith the packing-bars c and with the face-plate C above. It is formedwith ianges fon its under side, that fit loosely within'the valve A, andthis plate is of such size that its outer edges are in line, or nearlyso, with the outer edges of the packing-bars c but in case more frictionis desired this plate D may project over the edges of the packing-bars.The upper surface of the balance-plate is formed with longitudinal andtransverse oil-grooves gg, and the surface of such grooves is made toequal the surface of the packing-bars bcneath the plate, the objectbeing to insure exact balance of the plate under any steam-pressure, andto prevent friction between the balance-plate and the face-plate, exceptwhat may be due to the upward pressure of the springs of thepacking-bars.

The face-plate C fits closely in the steamchest, with the exception ofopenings t', that are provided to allow free circulation of steam in thechest. The plate is supported by rests k k, that are cast upon its underside and take upon the valve-seat or bottom of thechest 5 or they may besupported by lugs cast upon the inner surface ofthe chest. Set-screwslin the steamchest cover serve to hold the face-plate down. When thevalve wears or is faced down the face-plate is correspondingly adjustedby reducing the length of the rests lo. For oilin g the valveV therecessm is formed in the nppersurface of theuface-platc, and a smallaperture,n, is made through the plate at its center and beneath anoil-cup in the steam-chest cover. The oil will pass through the openin gn to the oil-grooves in the balanceplate D, and by these grooves bedistributed over the contact-surfaces.

The object in constrlgcting the valve with perpendicular faces is toallow the removal of all pressure from the valve except what isnecessary to keep it down on its seat when the having a less face thandepth, the pressure by IOO off to correspond with the reduction in thedepths of the valve.

It will be understood that the balance-plate D moves with the valve, itsobject being to obtain a broader Wearing-surface without increase ofpressure; and it is to be observed that there is no pressure on thebalance-plate except what is given to it by the packing, and if that isfound to be excessive it can be rcduced by increasing the exposedsurface of the oil-grooves; but iu no case should the surface of theoil-grooves be greater than the surlace of the packing. Theseoil-grooves insure complete lubrication of the friction-surfaces.

The slots in the balance-plate arc to allow the escape of steam to theexhaust-cavity in case the facings become Worn sufficiently to allow thesteam to blow through. v Further, by using this balance-platethepachings are entirely preserved from wear, so that when once fittedit will not be necessary to renew them.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

1. The balance-plate D, formed with flanges and oil-grooves, as shownand described, in combination with the slide-valve A, face-plate G, andsteam-chest, substantially as described.

2. The balance-plate D, formed with [langes and oil-grooves, 1ncombination with a slidevalve provided with spring-actuated packingbarsc, and the face-plate C, substantially as described, and for the purposeset forth.

In slide-valves, the balauceplate D, iitted for movement with the valve,and formed with oil-grooves upon its upper side, in combination withface-plate C, having a central aperture, m, substantially as shown anddescribed.

4. The combination ofthe slide-valve A, formed with perpendicular faces,the square packing-bars c, tted in grooves iu the upper edges ot' thevalve, the balance-plateD, provided with oil-grooves upon its upperside, and the face-plate C, supported by the rests k, all substantiallyas described, for opela-tion as set forth.

JOHN J. DE LANGEY. Witnesses: l

P. P. ROGERS, T. P. CALKIN.

